* { box-sizing: border-box; font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; }
body { margin: 0; padding: 0; background: #f4f7f6; color: #333; }

.container { display: flex; height: 100vh; }

.form-section {
    width: 400px;
    padding: 20px;
    background: #ffffff;
    overflow-y: auto;
    border-right: 1px solid #ddd;
    box-shadow: 2px 0 5px rgba(0,0,0,0.05);
}

fieldset {
    border: 1px solid #e0e0e0;
    border-radius: 6px;
    margin-bottom: 15px;
    padding: 15px;
}
legend { font-weight: bold; color: #555; }

input {
    width: 100%;
    padding: 10px;
    margin-bottom: 10px;
    border: 1px solid #ccc;
    border-radius: 4px;
}

.marks-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
}
.marks-grid input { margin-bottom: 0; }

.actions { display: flex; gap: 10px; margin-top: 20px; }
button {
    flex: 1; padding: 12px; border: none; border-radius: 4px;
    cursor: pointer; font-weight: bold; color: white;
}
#previewBtn { background: #2563eb; }
#downloadBtn { background: #16a34a; }

.preview-section {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
    background: #e2e8f0;
    overflow: auto;
}

canvas {
    max-width: 100%;
    max-height: 90vh;
    box-shadow: 0 10px 25px rgba(0,0,0,0.2);
    border-radius: 4px;
}
.bulk-list {
    max-height: 250px;
    overflow-y: auto;
    margin-top: 15px;
    border: 1px solid #eee;
    border-radius: 4px;
}

.student-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 8px 10px;
    border-bottom: 1px solid #eee;
    font-size: 14px;
}

.student-row:last-child { border-bottom: none; }
.student-row span { font-weight: 500; }

.download-single-btn {
    background: #10b981;
    color: white;
    border: none;
    padding: 5px 10px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 12px;
}